Eighteen Sound 18NLW4100 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 30 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 11.20
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 15mm
• Air volume displaced at xmax VD 1838cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.9Ω
• Inductance (1kHz) LE 2.29mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 29N/A
• Motor constant Bl/√RE 13.1N/√W
• Material Neodymium

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 307g
• Moving mass (without air load) MMD 277g
• Material Weather protected

Suspensions

• Stiffness KMS 11.6N/mm
• Compliance CMS 86µm/N
• Equivalent volume to the compliance VAS 180L
• Mechanical resistance RMS 5.34N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 232mm
• Flange thickness 23mm
• Mounting depth 209mm
• Volume occupied by the driver (estimated) 6.5L
• Net weight 10.0kg